LINDSAY Lohan might have learned her fun-loving ways from her mom, Dina. Mama Lohan headed to Miami last weekend and partied like a teenager, our source said. On Friday, she and friends drank poolside at the Shore Club before moving on to Grass, where she ordered bottle service for her table and stayed for hours. The next night, she and a group of 20-somethings hit Suite, where they downed vodka and cranberry drinks and champagne – racking up a $750 bill, which the club graciously comped. Dina left the waitress a mere $100 tip, we hear. Dina, however, disputes the tale: “We weren’t drinking at all . . . We were there to see a DJ named Justin and possibly sign him,” she told Page Six.